Sec.  87.263   Frequencies.

   (a) Domestic VHF service. (1) Frequencies in the 128.8125–132.125 MHz and
   136.4875–137.00 MHz bands are available to serve domestic routes, except
   that the frequency 136.750 MHz is available only to aeronautical enroute
   stations located at least 288 kilometers (180 miles) from the Gulf of Mexico
   shoreline (outside the Gulf of Mexico region). The frequencies 136.900 MHz,
   136.925 MHz, 136.950 MHz and 136.975 MHz are available to serve domestic and
   international routes. Frequency assignments are based on 25 kHz spacing. Use
   of these frequencies must be compatible with existing operations and must be
   in accordance with pertinent international treaties and agreements.

   (2) A system or network of interconnected enroute stations may employ offset
   carrier  techniques on the frequencies listed in paragraph (a)(1). The
   carrier frequencies of the individual transmitters must not be offset by
   more than  ±8kHz.

   (3) The frequencies 122.825 and 122.875 MHz are available for assignment to
   enroute stations which provide local area service to aircraft approaching or
   departing a particular airport. These frequencies will be assigned without
   regard  to  the  restrictions  contained  in  Sec. 87.261 (c) and (d). Only
   organizations operating aircraft with a maximum capacity of 56 passengers or
   8,200  kg  (18,000  lbs) cargo will be authorized use of these enroute
   frequencies.

   (4) In Alaska, the frequencies 131.500, 131.600, 131.800 and 131.900 MHz may
   be  assigned  to  aeronautical  enroute stations without regard to the
   restrictions contained in  Sec. 87.261 (c) and (d).

   (5) The frequency 136.750 MHz is available in the Gulf of Mexico Region to
   serve domestic routes over the Gulf of Mexico and adjacent coastal areas.
   Assignment  of this frequency in the Gulf of Mexico Region shall be to
   licensees first licensed on this frequency in the Gulf of Mexico Region
   prior to January 1, 1994, their successors and assigns, and is not subject
   to the conditions in  Sec. 87.261(c) and paragraph (a)(2) of this section. For
   the purpose of this paragraph, the Gulf of Mexico Region is defined as an
   area bounded on the east, north, and west by a line 288 km (180 miles) from
   the  Gulf of Mexico shore line. Inland stations must be located within
   forty-eight kilometers (30 miles) of the Gulf of Mexico shore line.

   (b)  Domestic  HF  service.  (1)  Regular  use of high frequencies for
   aeronautical enroute or any aeronautical mobile (R) communications in the
   domestic service within the continental United States (excluding Alaska)
   will not be authorized.

   (2)  These frequencies (carrier) are available for assignment to serve
   aircraft operating in support of offshore drilling operations in open sea
   areas beyond the range of VHF propagation:

   kHz
   2878.0
   3019.0
   3434.0
   4672.0
   5463.0
   5508.0

   (3) Alaska: The following frequencies (carrier) are available for assignment
   to serve domestic air routes in the Alaska area:

   (i) Throughout Alaska: Shared with the FAA and assigned where an applicant
   shows the need for a service not provided by the FAA.

   kHz
   2866.0 5631.0

   (ii) Alaska Aleutian chain and feeders. 

   kHz
   2911.0 8855.0
   2956.0 10066.0
   5496.0 11363.0
   6580.0

   (iii) Central and Southeast Alaska and feeders. 

   kHz
   2875.0 6580.0
   2911.0 6604.0
   3470.0 8876.0
   5484.0 11357.0

   (iv) The following frequencies (carrier) are available to enroute stations
   in Alaska without regard to the restrictions contained in  Sec. 87.261 (c) or
   (d). These frequencies may also be used for communications between enroute
   stations concerning matters directly affecting aircraft with which they are
   engaged. Enroute stations located at an uncontrolled airport shall not
   transmit information concerning runway, wind or weather conditions during
   the operating hours of a unicom.

   kHz
   3449.0   5472.0
   5167.5^1 5490.0

   ^1The  frequency  5167.5 kHz is available to any station for emergency
   communications  in  Alaska. No airborne operations are permitted. Peak
   envelope power of stations operating on this frequency must not exceed 150
   watts. This frequency may also be used by Alaska private fixed stations for
   calling purposes, but only for establishing communications.

   (c)  International VHF service. Frequencies in the 128.825–132.000 and
   136.000–137.000  MHz  bands  are available to enroute stations serving
   international flight operations. Frequency assignments are based on 25 kHz
   channel  spacing. Proposed operations must be compatible with existing
   operations in the band.

   (d)  International HF service. High frequencies (carrier) available to
   enroute stations serving international flight operations on the Major World
   Air Route Areas (MWARA's), as defined in the international Radio Regulations
   and the ICAO Assignment Plan, are:

   (1) Central East Pacific (CEP):

   kHz
   2869.0 8843.0
   3413.0 10057.0
   4657.0 11282.0
   5547.0 13300.0
   5574.0 17904.0
   6673.0

   (2) Central West Pacific (CWP):

   kHz
   2998.0 6562.0
   3455.0 8903.0
   4666.0 10081.0
   5652.0 11384.0
   5661.0 13300.0
   6532.0 17904.0

   (3) North Pacific (NP):

   kHz
   2932.0 10048.0
   5628.0 11330.0
   6655.0 13300.0
   6661.0 17904.0

   (4) South Pacific (SP):

   kHz
   3467.0 10084.0
   5559.0 11327.0
   5643.0 13300.0
   8867.0 17904.0

   (5) North Atlantic (NAT):

   kHz
   2872.0 8825.0
   2899.0 8831.0
   2962.0 8864.0
   2971.0 8879.0
   3016.0 8891.0
   3476.0 8906.0
   4675.0 11279.0
   5598.0 11309.0
   5616.0 11336.0
   5649.0 13291.0
   6622.0 13306.0
   6628.0 17946.0

   (6) Europe (EUR):

   kHz
   3479.0 10084.0
   5661.0 13288.0
   6598.0 17961.0

   (7) South America (SAM):

   kHz
   2944.0 10024.0
   3479.0 10096.0
   4669.0 11360.0
   5526.0 13297.0
   6649.0 17907.0
   8855.0

   (8) South Atlantic (SAT):

   kHz
   2854.0 8861.0
   2935.0 11291.0
   3452.0 13315.0
   5565.0 13357.0
   6535.0 17955.0

   (9) Southeast Asia (SEA):

   kHz
   3470.0 10066.0
   3485.0 11396.0
   5649.0 13309.0
   5655.0 13318.0
   6556.0 17907.0
   8942.0

   (10) East Asia (EA):

   kHz
   3016.0 10042.0
   3485.0 11396.0
   3491.0 13297.0
   5655.0 13303.0
   5670.0 13309.0
   6571.0 17907.0
   8897.0

   (11) Middle East (MID):

   kHz
   2944.0 6631.0
   2992.0 8918.0
   3467.0 8951.0
   3473.0 10018.0
   4669.0 11375.0
   5658.0 13288.0
   5667.0 13312.0
   6625.0 17961.0

   (12) Africa (AFI):

   kHz
   2851.0 6673.0
   2878.0 8894.0
   3419.0 8903.0
   3425.0 8894.0
   3467.0 11300.0
   4657.0 11330.0
   5493.0 13273.0
   5652.0 13288.0
   5658.0 13294.0
   6559.0 17961.0
   6574.0

   (13) Indian Ocean (INO):

   kHz
   3476.0 13306.0
   5634.0 17961.0
   8879.0

   (14) North Central Asia (NCA):

   kHz
   3004.0 6592.0
   3019.0 10096.0
   4678.0 13303.0
   5646.0 13315.0
   5664.0 17958.0

   (15) Caribbean (CAR):

   kHz
   2887.0 8846.0
   3455.0 8918.0
   5520.0 11387.0
   5550.0 11396.0
   6577.0 13297.0
   6586.0 17907.0

   (e) Long distance operational control. Long distance operational control
   frequencies provide communications between aeronautical enroute stations and
   aircraft stations anywhere in the world for control of the regularity and
   efficiency of flight and safety of aircraft. World-wide frequencies are not
   assigned by administrations for MWARA and Regional and Domestic Air Route
   Area (RDARA).

   kHz
   3013.0  10075.0
   3494.0  11342.0
   5529.0  11348.0
   5538.0  13330.0
   6637.0  13348.0
   6640.0  17925.0
   8933.0  21964.0
   10033.0

   (f) 121.500 MHz: Emergency and distress only.

   [ 53 FR 28940 , Aug. 1, 1988, as amended at  54 FR 11721 , Mar. 22, 1989;  55 FR 28628 , July 12, 1990;  56 FR 21084 , May 7, 1991;  58 FR 44954 , Aug. 25, 1993;
    66 FR 26800 , May 15, 2001]